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<head><meta charset="utf-8"><title>I-prioritize #79708 Miscompilation root-caused to llvm bug · t-compiler/wg-prioritization/alerts · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/index.html">t-compiler/wg-prioritization/alerts</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html">I-prioritize #79708 Miscompilation root-caused to llvm bug</a></h3>

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<a name="218885238"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218885238" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218885238">(Dec 04 2020 at 20:11)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="3111">@WG-prioritization/alerts</span> issue <a href="https://github.com/rust-lang/rust/issues/79708">#79708</a> has been requested for prioritization.</p>
<h1><a href="https://forge.rust-lang.org/compiler/prioritization/procedure.html#assign-priority-to-unprioritized-issues-with-i-prioritize-label">Procedure</a></h1>
<ul>
<li>Priority?</li>
<li>Regression?</li>
<li>Notify people/groups?</li>
<li>Needs <code>I-nominated</code>?</li>
</ul>



<a name="218894773"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218894773" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Noah Lev <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218894773">(Dec 04 2020 at 21:41)</a>:</h4>
<p>(deleted - wrong thread)</p>



<a name="218894904"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218894904" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Noah Lev <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218894904">(Dec 04 2020 at 21:43)</a>:</h4>
<p>No idea what priority this should be <span aria-label="laughing" class="emoji emoji-1f606" role="img" title="laughing">:laughing:</span></p>



<a name="218898346"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218898346" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218898346">(Dec 04 2020 at 22:16)</a>:</h4>
<p>I think P-high or P-critical since this is unsound</p>



<a name="218898380"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218898380" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Joshua Nelson <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218898380">(Dec 04 2020 at 22:17)</a>:</h4>
<p>I only suggest P-high because it's been around from 2015, but it's impacting people in production so P-critical seems appropriate</p>



<a name="218900552"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218900552" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Noah Lev <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218900552">(Dec 04 2020 at 22:42)</a>:</h4>
<p>Higher priority is safer than lower :)</p>



<a name="218900567"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218900567" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Noah Lev <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218900567">(Dec 04 2020 at 22:42)</a>:</h4>
<p>I think let's wait for some more people to jump in perhaps before we prioritize</p>



<a name="218900590"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218900590" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Noah Lev <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218900590">(Dec 04 2020 at 22:42)</a>:</h4>
<p>Or you can label with P-critical if you think that's right</p>



<a name="218962622"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218962622" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> DPC <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218962622">(Dec 06 2020 at 01:18)</a>:</h4>
<p>i guess p-high would be fine on this one</p>



<a name="218996055"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/218996055" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Hameer Abbasi <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#218996055">(Dec 06 2020 at 17:33)</a>:</h4>
<p>If it's that old, it probably occurs rarely. <code>P-high</code> is fine, I think.</p>



<a name="219018835"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219018835" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Noah Lev <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219018835">(Dec 06 2020 at 21:10)</a>:</h4>
<p>Hmm, I agree with Joshua that this should be P-critical since it's unsound and impacting people in production.</p>



<a name="219053129"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219053129" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Hameer Abbasi <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219053129">(Dec 07 2020 at 08:41)</a>:</h4>
<p>I don't have a strong opinion, I'm fine with <code>P-critical</code>.</p>



<a name="219079367"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219079367" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219079367">(Dec 07 2020 at 13:31)</a>:</h4>
<p>I'm not used to looking at LLCM bugs... From what I undestand from <a href="https://reviews.llvm.org/D91576">https://reviews.llvm.org/D91576</a>, this is now fixed on LLVM upstream?</p>



<a name="219079571"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219079571" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219079571">(Dec 07 2020 at 13:33)</a>:</h4>
<blockquote>
<p>most likely 1.47.0 just exposed inputs that trigger it</p>
</blockquote>
<p>So this may not actually be an issue that's been here since 2015 <em>in Rust</em>?</p>



<a name="219079695"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219079695" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219079695">(Dec 07 2020 at 13:34)</a>:</h4>
<p>I think <code>P-critical</code> sounds right, and maybe <code>I-nominated</code> to discuss a cherry-pick of the LLVM patch?</p>



<a name="219110482"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219110482" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> DPC <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219110482">(Dec 07 2020 at 17:29)</a>:</h4>
<p>i guess we don't need both then, i-nominated should suffice imo</p>



<a name="219118766"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219118766" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219118766">(Dec 07 2020 at 18:32)</a>:</h4>
<p>Issue <a href="https://github.com/rust-lang/rust/issues/79708">#79708</a>'s prioritization request has been removed.</p>



<a name="219120348"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219120348" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219120348">(Dec 07 2020 at 18:43)</a>:</h4>
<p>I'll fill the agenda for the issue now I guess</p>



<a name="219140726"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize%20%2379708%20Miscompilation%20root-caused%20to%20llvm%20bug/near/219140726" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Stu <a href="https://rust-lang.github.io/zulip_archive/stream/245100-t-compiler/wg-prioritization/alerts/topic/I-prioritize.20.2379708.20Miscompilation.20root-caused.20to.20llvm.20bug.html#219140726">(Dec 07 2020 at 21:28)</a>:</h4>
<p>&lt;wrong topic&gt;</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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